these are current temperatures. forecast lows will be in the mid-and upper 30s, so pretty chilly out there now, plenty of frost tomorrow morning when you wake up, santa rosa 33, 35 at napa, doesn't have to be freezing to get frost. ever notice how it freezes on that front windshield because the inside of the car gets colder than the ground. so certain surfaces like windshields and cars get frost more easily, but you don't need freezing temperatures. sunny and mild tomorrow, extended forecast calling for warmer temperature. the high pressure sets up a warming trend and northerly breeze, stays with us not just tomorrow but through friday and then it breaks down. s that starts to break down -- as that starts to break down we got a shot of something coming in towards the middle to end of next week. the forecast daytime highs tomorrow, 67 in napa and santa prose a, so warm again. some of -- santa rosa, so warm again. some of these numbers will vary depending where you live.